| File::Pid(3pm) | User Contributed Perl Documentation | File::Pid(3pm) |
File::Pid - Pid File Manipulation
use File::Pid;
my $pidfile = File::Pid->new({
file => '/some/file.pid',
});
$pidfile->write;
if ( my $num = $pidfile->running ) {
die "Already running: $num\n";
}
$pidfile->remove;
This software manages a pid file for you. It will create a pid file, query the process within to discover if it's still running, and remove the pid file.
my $pidfile = File::Pid->new;
my $thisfile = File::Pid->new({
file => '/var/run/daemon.pid',
});
my $thisfileandpid = File::Pid->new({
file => '/var/run/daemon.pid',
pid => '145',
});
This constructor takes two optional parameters.
"file" - The name of the pid file to work on. If not specified, a pid file located in "File::Spec->tmpdir()" will be created that matches "(File::Basename::basename($0))[0] . '.pid'". So, for example, if $0 is ~/bin/sig.pl, the pid file will be /tmp/sig.pl.pid.
"pid" - The pid to write to a new pidfile. If not specified, $$ is used when the pid file doesn't exist. When the pid file does exist, the pid inside it is used.
my $pidfile = $pidfile->file;
Accessor/mutator for the filename used as the pid file.
my $pid = $pidfile->pid;
Accessor/mutator for the pid being saved to the pid file.
my $pid = $pidfile->write;
Writes the pid file to disk, inserting the pid inside the file. On success, the pid written is returned. On failure, "undef" is returned.
my $pid = $pidfile->running; die "Service already running: $pid\n" if $pid;
Checks to see if the pricess identified in the pid file is still running. If the process is still running, the pid is returned. Otherwise "undef" is returned.
$pidfile->remove or warn "Couldn't unlink pid file\n";
Removes the pid file from disk. Returns true on success, false on failure.
This is a utility method that allows you to determine what "File::Pid" thinks the program name is. Internally this is used when no pid file is specified.
perl.
Casey West, <casey@geeknest.com>.
Copyright (c) 2005 Casey West. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
| 2022-06-13 | perl v5.34.0 |